Edits lost when I remove a camrec from the timeline???

I spent at least three hours today editing small problems like coughs out of a tutorial video. I have two camrecs in my project and I wanted to work on the second by itself. I saved my project, removed the first camrec from the timeline, and later put it back. Now, all those edits are gone. What happened? II'm in Camtasia Studio 7 on Win 7. Thanks.

The camrec file is your recorded video. It is essentially the same as a MP4 or wmv video file. Now don't get me wrong, you can only view a camrec file in Camtasia. When edits are made and saved they are saved as a camproj or trecproj, depending on your Camtasia version. If you saved your edits this is the file to open with all of your edits. If you removed the camrec from the timeline before you saved, then you lost your edits. Remember, Camtasia is a NLE (Non Linear Edinting) program. It will not change the original camrec file.

Thanks for the response Jason. Actually, a key reason this is very frustrating is that I hit ctrl-s after almost every single change. Saving often is something I learned years ago aas a new programmer. So I really expected that the project file would keep track of all that stuff. I did not know, however, that the camrec does not change. Interesting. I creating the camrec initially and then saved it in a new project. So I don't know what more I can do o prevent this in the future. In this particular case, I need to add a second camrec that has video only, figure out how to add audio to this second one only, and then add opeinng and closing jpegs to the start and end of he whole thing. I have done the jpeg piece before, but now I am afraid of removing anything from the timeline. Any advice? Thanks.